Transition Pages RePurposed is the rate at which the number of transition cache pages were reused for a different purpose. ...

Transition Pages RePurposed is the rate at which the number of transition cache pages were reused for a different purpose.  These pages would have otherwise remained in the page cache to provide a (fast) soft fault (instead of retrieving it from backing store) in the event the page was accessed in the future.  Note these pages can contain private or sharable memory.